Berserker Quest 6: The curse of the onyx medallion is a punishingly difficult and somewhat light-hearted co-op/singleplayer dungeon crawler. Berserker Quest is powered by the Darkplaces engine and coded by indie developer Armitage. The game is currently in active development with updates released on a regular basis.
The game combines elements from rogue-like games with a first person combat system similar to titles such as Dark Messiah and Oblivion. Players are able to venture into dungeons surrounding the overly cheerful town of Questborough in an attempt to gain items and skills that may assist them in purging the evil that has overtaken the town's castle.

Love the game, but unfortunately it's crashing my display driver. Happens most often in the arena (always within 5 seconds of loading the map) but randomly in other areas as well. I've tested both with the latest WHQL and beta nVidia drivers, ends with either a bluescreen, hard lock or a driver crash recovery.